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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b62e86c19a58766e590dd59918c069e947974e9b765dc0c9d99b0ca6af8364dd' 
  AND token = 'z6pVM5ab4cZp1Hg9TfhmNDfaeHTP502GogJpQ51J2HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}